Fig. 4From: Can mental health diagnoses in administrative data be used for research? A systematic review of the accuracy of routinely collected diagnosesBox plots summarising a positive predictive values (PPV) and b Cohen’s kappa of diagnoses reported in four or more studies. Treating each result as a point, the median of PPVs is the transition line, the interquartile range is indicated by the box and the range of findings by the whiskers. Numbers of studies in parenthesesBack to article page